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it <br /> 1 <br /> i.avreraville School nintrict <br /> 202/799--8221 <br /> July 28. 1987 <br /> SOIL BORING <br /> The purpose of the soil borings wits to explore the site for <br /> the presence of subsurface hydrocarbon contamination , and to <br /> define the vertical and areal extent of the contamination found <br /> at the site. The sail borings were located within 30 yards of <br /> the tnnk pit excavation to comply with a request from the San <br /> Joaquin County Local Ilea Ith Dlstrlct (see Figure 2. Site Plan ) <br /> 4 <br /> and were drilled with a truck mounted drill rig usini; 7 .5-inch <br /> O.D. (outside diameter) hallow stem augers . The drilling was <br /> performed under the direction of a Groundwater Technology, Inc . <br /> geologist who maintained it continuous log of the materials <br /> encountered (see Appendix I . Drill Logs) _ <br /> ' SOIL SAMPLES <br /> add <br /> Soil samples were obtained during drilling using a 2.5-inch <br /> O.D. split spoon sampler lined with 2 inch by 6 inch brass sample <br /> F <br /> tubes . The sampler was driven eighteen inches (ahoad of the <br /> auger) at each Sampling polut _ Samples were collected at 5 foot <br /> Intervals bei;ifill init at 3 . 5 feet below ground surface to the <br /> bottom of the boring, where possible. The samples were preserved <br /> and transported un,lcr Chain-of-Custody in accordance with <br /> Groundwater TechnoIoj;y , luc: . ' s Standard Operating Procedures <br /> ( SDP` s I1 . 14 . 15 and 111 (seee Appendix 1I ) . the samples were <br /> analyzed fol' total volatile hydrocarbons and benzene , toluene , <br /> ethylbenzene and xylene using EPA Methods 8020 and 8015. <br /> fi <br />